Sep 17 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Hot Working Cold Working AnnealingApplications
Introduction
Copper-nickel alloys have excellent resistance to biofouling and marine corrosion, and possess good fabricability. Copper gains more strength and corrosion resistance when nickel is added to it.
UNS C70600 is one type of copper-nickel alloys, which has excellent corrosion resistance even in marine environments. This alloy possesses average high strength and good creep resistance at high temperatures, and costs more in comparison to copper-aluminum alloys and other alloys with similar mechanical properties.
The following datasheet will provide more details about UNS C70600 copper nickel alloy.
Chemical Composition
The following table shows the chemical composition of UNS C70600 copper nickel alloy.
| Element |
Content (%) |
| Cu |
88.7 |
| Fe |
13 |
| Ni |
10 |
Physical Properties
The physical properties of UNS C70600 copper nickel alloy are outlined in the following table.
| Properties |
Metric |
Imperial |
| Density |
8.94 g/cm3 |
0.323 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C70600 copper nickel alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Tensile strength |
303-414 MPa |
43900-60000 psi |
| Yield strength (depending on temper) |
110-393 MPa |
16000-57000 psi |
| Elongation at break (in 254 mm) |
42% |
42% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Poisson’s ratio |
0.34 |
0.34 |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
| Shear modulus |
52.0 GPa |
7540 ksi |
Thermal Properties
The thermal properties of UNS C70600 copper nickel alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-300°C/68-572°F) |
17.1 µm/m°C |
9.50 µin/in°F |
| Thermal conductivity (@20°C/ 68°F ) |
40 W/mK |
278 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to UNS C70600 copper nickel alloy are:
| ASME SB111 |
ASME SB171 |
ASME SB359 |
ASME SB395 |
| ASME SB466 |
ASME SB467 |
ASME SB543 |
ASTM B111 |
| ASTM B151 |
ASTM B122 |
ASTM B171 |
ASTM B359 |
| ASTM B395 |
ASTM B432 |
ASTM B466 |
ASTM B469 |
| ASTM B543 |
ASTM B608 |
DIN 2.0872 |
MIL C-15726 |
| MIL T-15005 |
MIL T-16420 |
MIL T-22214 |
SAE J461 |
| SAE J463 |
|
|
|
Fabrication and Heat Treatment
Machinability
The machinability rate of UNS C70600 copper nickel alloy is 20.
Welding
Soldering, brazing, oxyacetylene welding, gas shielded arc welding, coated metal arc welding, spot welding, seam welding, and butt welding are considered as suitable for UNS C70600 alloy.
Hot Working
The hot working capacity of UNS C70600 copper nickel alloy is good with the recommended hot working temperature ranging between 760 and 816°C (1550 and 1750°F).
Cold Working
The cold working capacity of UNS C70600 is good.
Annealing
The annealing temperature of UNS C70600 copper nickel alloy is between 593 and 816°C (1100 and 1500°F).
Applications
UNS C70600 copper nickel alloy is primarily used for seawater service as forged and machined valve and pump components, fittings and hardware. This alloy is also used in applications requiring high corrosion resistance and where chloride stress-corrosion cracking precaution prevents usage of stainless steels.